The 2026 federal budget rewrites the rules on capital gains tax for property investors. The headline: the flat 50% CGT discount is gone, replaced by a CPI indexation model that works very differently.
If you own investment property, or you're planning to buy one, this affects your strategy. Here's what actually changed, how the transition works, and what it means for your next move.
What Changed: The 50% CGT Discount Is Being Replaced
Since 1999, the CGT discount has been straightforward. Hold an asset for more than 12 months, sell it, and you pay tax on only half the capital gain. Simple.
The 2026 budget scraps that model and replaces it with the pre-1999 indexation approach. Under the new system, your cost base (what you paid for the property) gets adjusted upward each year in line with CPI, the consumer price index. When you sell, your taxable gain is the sale price minus the inflation-adjusted cost base.
This is part of a broader tax reform package that also includes changes to negative gearing and trust taxation.
Old System vs New System: A Quick Comparison
The old way (50% discount): You buy a property for $500,000. You sell it five years later for $700,000. Your capital gain is $200,000. You apply the 50% discount. You pay tax on $100,000.
The new way (CPI indexation): Same property, same numbers. Instead of a flat 50% discount, your $500,000 cost base is indexed to inflation each year. If cumulative CPI over five years is 15%, your adjusted cost base becomes $575,000. Your taxable gain is $700,000 minus $575,000 — $125,000.
In this example, indexation gives you a smaller discount than the flat 50%. But in periods of high inflation, indexation could actually be more generous. The key difference is that the benefit now tracks the economy rather than being a fixed percentage.
Grandfathering: What Happens to Properties You Already Own
This is the part most investors care about. The government is using a hybrid grandfathering approach: gains already accrued on existing assets will be taxed under the old 50% discount rules, but future gains on those same assets will fall under the new indexation model.
Think of it as drawing a line. Everything before the line uses the old rules. Everything after uses the new ones. This approach recognises that investors made decisions based on the rules that existed at the time, while still moving the system toward the new model going forward.
For negative gearing, the grandfathering is different and simpler: those changes are fully grandfathered and only apply to properties acquired after budget night. If you already own a negatively geared property, nothing changes on that front.
The One-Year Grace Period: You Have Until July 2027
Here's a detail that got buried in the initial coverage but matters a lot for timing.
According to the Australian Financial Review, assets acquired after budget night will still receive the current 50% CGT discount until July 1, 2027. After that date, they switch to the new CPI indexation model.
The government designed this one-year grace period to prevent a stampede of buyers rushing to settle before a hard deadline. It gives the market time to adjust without creating a panic.
What this means in practice: if you buy an investment property today, you'll still get the 50% discount on any gains until mid-2027. After that, indexation kicks in. The same transition timeline applies to the negative gearing changes.
Why the Government Made This Change
The combination of negative gearing and the CGT discount has made housing investment significantly more attractive than other asset classes. Run a property at a loss, deduct those losses against your wage income, then sell and pay tax on only half the gain. That loop has been a core strategy for Australian property investors for over two decades.
Economists broadly expect some investors to exit the market as a result, leading to higher home ownership rates, a modest decrease in house prices, and slightly higher rents.
What This Means for Your Next Property Investment
The CGT changes don't kill property investment. They change the maths. A few things worth thinking through:
- Review your hold strategy. The flat 50% discount rewarded all investors equally regardless of inflation. Indexation rewards patience during inflationary periods. Your hold period and growth assumptions now matter more.
- Understand the grandfathering split. If you already own investment property, your existing gains are protected. But gains from here forward use the new model. Factor this into any decision about whether to hold or sell.
- Use the grace period wisely. You have until July 1, 2027 before the new rules take full effect on new acquisitions. That's not a reason to rush into a bad purchase, but it is worth factoring into your timeline if you're already close to buying.
- Get your suburb research right. With the tax advantages of property investment narrowing, picking the right suburb and property becomes even more important. The margin for error is smaller when the tax system isn't padding your returns as generously.
If you're weighing up your next investment and want suburb-level data to back your decision, PropSpotter's coaching program walks you through the research process step by step. Or if you want to talk through how these changes affect your specific situation, you can book a free strategy session.
Is Capital Gains Tax Changing in 2026?
Yes. The 2026 federal budget replaces the blanket 50% CGT discount with a CPI indexation model. Instead of a flat discount on your capital gain, your cost base is adjusted for inflation each year. The change is part of a broader package that also includes reforms to negative gearing and trust taxation.
What Are the Proposed Changes to Capital Gains Tax in Australia?
The current system gives a 50% discount on capital gains for assets held longer than 12 months. Under the new model, the cost base is indexed to CPI instead — a return to the pre-1999 system. Existing assets receive partial grandfathering: gains already accrued are taxed under the old rules, but future gains on those assets use the new indexation method.
Will Capital Gains Tax Go Up in 2026?
It depends on the asset and how long you hold it. In high-inflation periods, CPI indexation could result in a lower taxable gain than the flat 50% discount. In low-inflation periods, the opposite is true. The net effect varies by individual circumstance. What is clear is that the system is becoming more complex, and investors need to run the numbers for their specific properties.
What Is the Current Capital Gains Tax for 2026?
For assets acquired before budget night (May 2026), the existing 50% CGT discount still applies to gains already accrued. For assets acquired after budget night, the 50% discount applies until July 1, 2027, after which the new CPI indexation model takes effect. If you want help understanding how this affects your investment plans, a buyer's agent alternative like PropSpotter gives you the research tools and coaching to make confident decisions.